I have the Guardian mounted on an old Goldberg Ultimate powered with an RCGF 15. The engine will turn the 15/6 prop at 6000.
I mounted the engine on a Hyde mount and that took care of the problem up to about 5000 rpm but it went out at full throttle.
I then mounted the Guardian on a 1/8 aluminum plate that is mounted on 1/2 foam rubber with double stick tape. Ground tests indicate the problem is solved but engine problems have prevented me from flying it. I am out of time for this summer. Its too hot to fly here anymore. I am headed to the mountains for the summer.
I think a twin would make things easier.

I had the Guardian mounted on double stick tape on a 80" Katana powered with a DLE 30 a couple of months ago. I intended to try it once I got it up high but the aircraft suddenly rolled oven and went in. I think I inadvertently turned the Guardian on as that is what happens if vibration gets to it according to my ground tests